jobs

adults that are in family’s are more likely to stay in there jobs for longer, pay there taxes

housing

if there was no family’s would we just live by ourselves ? wouldn’t this be worse for the environment

rasining children in a stable loving home is a vital part of it as well (maybe you could try and look at certain sistics of marriage brake ups, single family’s that kind of thing (like such as 30% of childernen from single parent familys go on to comit crime) not that this is true or not just have a look at some sistics maybe do a graph and stuff and as well

also look at the flip side of it as well and try to think of ways where what would it be like if familys wernt around ? maybe adults would be harder working, with less holidays, brakes, and time off if they didnt have a family or childern to think about, there would be less medical bills, less kids, (i guess)

i wish i could help you more but ive got work to do lol hope it goes okay