I can only help with the ants.

Get a bucket & fillt it waith warm water (not too hot or u'll kill the grass), add alot of soap & make bubbly. Pour it on the ant hills & repeat in a few days to let the grass heal.

Do this for a few weeks & u'll kill off a large part of the hill for a long time, if not the whole summer. But they'll be back next year.

its only a temp thing, but its non-toxic to pets & other animals & kids.

I did it every year & it worked for me. But my hills took up the whole backyard, so it took all day to treat the yard & since I didn't have anymore grass (didn't take care of it, didn't really care) I used hot water (the ants use to attack my dog & he was so scared to go in they yard