Just a "how does this work? query from the video - pregnant/teen mom foster kids?

I was going to askt his in my other thread but it's really just a question of curiosity on my end, from a situation on the adoptuskids 2 hour video. There's a family that adopts a teenage girl who had a child of her own on the video. I'm just curious how that works. I imagine it's not *too* common but one never knows; maybe someone else will need the answer, too.) How does it work when you foster/adopt a teen with her own child like the one family did, where the girl is thankful because they'd have been split apart otherwise? Obviously the teen birth mother needs a lot of encouragement to parent her own child; do the same requirements apply as for siblings so they need separate rooms if different genders,/babies can't sleep with the mom past a year (well, if different genders in that case; it wouldn't matter if it's a teen mom with a girl.) Do the foster parents get help with both? Does the girl get help? If pregnant, is there help for the mom - well, I guess it'd be Medicare, huh? - for all her pregnancy screenings a pre-natal tests? Does the social worker need a machete to cut through the confusion and red tape of a foster child hving a biolgogical child she's parenting, or what? :-)