So i finished all the Dawnguard missions, i chose to join the Dawnguards thinking oh i can become a vampire afterwards for fun if i want to. then when i talked to Serana, i for some reason assumed asking if she wanted to be cured as just a conversation, to hear her say she wants to stay as who she is.. turns out she just walked away and went to be fixed...

so now, i have no way to become a vampire when i want to. is there a code for this?

or, if i just get bitten by a random vampire NPC, do i get to become a vampire lord?

also, i have 2 kids and a wife at my manor, do they do anything else? besides walking around and kids asking me for game/money/gift occasionally? the house is fully built everything is done, does that mean the dlc is finished or are there missions for/from the kids and wife.

thanks!

Serana is the only NPC (when you finish DG) that can turn you into a Vampire Lord. Once she's cured, no more VL.

so is there a code to enable VL then?

If you're on PC, I'm sure there is. If on console, then no.