Hello, chest hair aficionados dwarf fans!
Dwarven Wardens enjoyed some pretty involved family backgrounds. Rica and good ol' Mam and Bhelen and Trian and Endrin and Endrin 2 and possibly Endrin 3 (
)... I'm curious how you imagine Cadash's family? I mean, they're a crime family, but the game also says you spent your life on the streets. I'm not sure if that implies you were prowling about and causing trouble, or were straight-up homeless!
I can't decide if my Cadash is more Corleone or Brosca II. Are there just dozens of cousins and uncles and nieces and brothers? Do you have a core family unit and only keep in touch with the rest of the clan on a strictly business basis, or are your third step-cousins twice removed considered ride-or-die kin? Are you an orphan? Does your great great granny Cadash rule everybody with an iron fist? Has your Cadash ever been married, widowed, or a parent before? I'm so curious!
I think they left it very open to interpretation, but it's hard to say based on the starter text for a dwarf:
"A cast-off "surfacer," unwelcome among the dwarves or most humans, you have scraped by as part of a criminal fraternity known as the Carta, smuggling magical ore known as lyrium. As part of the ruthless Cadash crime family, you spent your life on the streets of various Free Marcher city-states—until you were sent to the Chantry conclave as a spy and everything changed."
There is never any reference to relatives or family in the War Table missions either, and in fact they suggest that the family was ready to turn on you for messing up the lyrium deal at the Conclave. So, you can probably headcannon that you're part of a large, tight-knit family and you were being groomed as someone's heir, or that you're a poor distant cousin to the actual powerful members of the Cadashes, an orphan, or even that you acquired the name when you joined the Carta.
I tend to assume they aren't particularly tight-knit (the families in Orzammar seem more tied by the appearance of honor than by affection a lot of the time.) Zhenya isn't closely related to any of the powers in the family, but her family was solidly enough involved that she got good training in fighting from an early age. She's a little bit of a black sheep in that she stubbornly refused to be involved in some activities, but was so good in a fight when guarding shipments that they were willing to let her get away with it. I never really defined her family other than that she probably isn't an orphan and has siblings and lots of cousins because it wasn't that relevant - she's the loner of the group, not because of any family melt-downs. She was at the Conclave as a guard for a lyrium shipment. Never married, doesn't want to be.
Zheeva, on the other hand, was born in Orzammar, but doesn't know much more than that herself. Her mother was a member of the Cadash branch of the Carta who managed to corrupt a Miner caste alchemist who knew the process for refining lyrium, and had three children by him, Zheeva and an older brother and sister. He finally got caught refining lyrium for the Carta just after Zheeva was born, and her mother was killed while they were fleeing to the surface, and her father blamed the infant Zheeva for slowing them down. They lived a very marginal existence on the surface, with her father doing alchemical work when he was sober, and trading work for the Carta for protection through his tenuous connections with his dead mistress. He trained Zheeva as an alchemist, including some of the miner craft secrets that the Carta desperately wanted, and when her siblings were old enough, he borrowed money from the Carta with Zheeva as collateral to buy their way into respectable merchant surfacer families. He died not long after that, which may or may not have been helped along by the Carta, and her siblings handed the pre-teen girl over to the Carta. Zheeva only knew that her father wasn't born casteless and knew miner caste secrets and apparently trained her in them so he could sell her to the Carta. No contact with the brother or sister who don't want their new respectable families to know they have a relative in the Carta. Never married, never thought about it.
Reska is the daughter of powerful Carta leaders and was groomed for a very specific role as their contact (and spy) with noble human families on the surface. She's articulate, knows how to behave and how to manipulate, and nothing misses her notice. But she was never directly involved in any of the violent parts of their operations or with the actual blackmail her information was used for because it was important for her to have a spotless reputation. She's fairly close to her parents and her sister, but ruthless. Her mother controls the family's smuggling of luxuries rather than lyrium as well as their blackmailing operations against human and dwarven nobles, but her father negotiates lyrium sales on the surface and coordinates shipments. Reska was sent to the Conclave because she was the perfect person to protect their interests and spot possibilities for blackmail and/or lyrium sales that she was supposed to pass onto the now-dead team who was with her. She expected to make a "family" marriage to one of the other Carta families eventually but planned to make certain it was someone who would understand just how good she was with poisons... 
Haven't worked out Vetra's story yet...