BM gets the skids Thursday after school (picks up at our house) until Monday before school (drops off skids at school).

In the summer SS16 takes his XBOX to BM's since there is no school. Well lately BM has been bringing SS16 to our house Monday mornings to drop of the XBOX. He opens the garage and puts it in the garage, and then leaves and she takes him to school.

During the time that skids are gone, sometimes I go out in the public space (open windows) not fully dressed, and DH and I don't have to be quiet in the bedroom (which is right next to the garage). 

I'm on the schools parent contact list for the skids, no biggie.

Got an email from SD12's teacher, she has a 20% in the class currently, teacher wants her to go to Saturday school if possible (she's going to BM's this weekend which is an hour away).

Asked DH if he saw the email, he said no, told him what it said. He checked her other class grades ALL FAILING. He blocked her phone except for phone calls and text messages. She asked IMMEDIATELY why it was blocked,he told her, she said she was working on it, he said he'd unblock once her grades were up.

So skids go to BM's every other weekend, Thursday evening to Monday morning.

I try to make some yummy dinners for us since we don't have kids to feed (they're not overly picky but I do try to make things I know they'll eat). Well older kids...DD2 doesn't count in my book because I always have to feed her separately anyways because she has to eat ASAP when she gets home at 5:15.

So since I'm pregnant about to pop (hopefully) does anyone have any yummy, yet simple meals for two they can share?

DD is almost 2, and doesn't understand yet, but I imagine as she gets older she'll start to ask questions as to why the skids leave every other weekend, and why they have a different mom.

So what is your advice/experience on explaining to a very young child that basically DH was married before to BM but it didn't work out, all the while not making her question or worry about my and DH's marriage?