Now I know I can have almost anyone be my steward at my hearthfire house but say I have Lake view manner and I want to build another house by dawnstar, can I have someone else be my steward? Also can I only have pets if I have adopted kids?

You can have a different steward for all three houses.

You can have one steward per home (for a total of three). Yes, you can only have pets if you adopt kids. You can still have an animal follower without adoption, but it won't be able to permantently stay in your home.

Okay and do you know the max amount of people I can have at my house? I know mjoll has that creepy guy follow her to her new home if I marry her but is there anybody else like that? How many people can I have and how can I have a house Carl and a steward at my place? Last questions lol

A housecarl, steward, bard, spouse,a pet, and two children.

Plus a follower (and temporary quest followers, or multiple followers with mods). Without mods, your follower will only be there when you are, of course.

Don't forget the limo driver!

Most of my wives are either Jordis or Lydia (both housecarls). Whoever I'm not married too I bring in as my steward (still a housecarl). Add to that the actual housecarl for whatever Hearthfire home Im in and I have 3 housecarls defending my house. Nuff said.

In addition to what I said above, you can have a carraige driver and bard, both of whom will join the fray if your house is attacked.