Lakeview Manor is my family house, it has a bedroom wing. If i had children where would they sleep? The only places with children beds are in the bedrooms, so if they slept there where would i sleep, i want a double bed. Also say if i had other people too like a steward, where would they sleep?

Im not a fan of the beds in the front room, it is supposed to be the hallway why would you have beds in a hallway?

You can build a double bed and two singles in the bedroom wing, for you, spouse, and kids. The housecarl and steward won't sleep if you build no more beds, but they will stay. If you don't build the other beds, the places where they should be built stays empty, you can't put anything else there. The upstairs in most Skyrim/Hearthfire homes is supposed to be only for family anyway, why not save first, then build them and see what they look like? With the nice furnishings you can put with them, it's really quite nice.

You might want to check out http://www.gamesas.com/topic/1445011-how-many-beds/; a lot of discussion about beds and bedrooms went on there.