Keep them busy at home and when they start to get boisterous take them out to a field with a football. Have a set time when Dad comes out and stick to it. Some of it may be attention seeking to get Dad to join in.
Presumably in the daytime the 5 year old is at school so mostly you need to keep the 3 year old busy. Who looks after him normally if DiL works?
Suggestions:
Anything with pastry, cutters, proddy things, then bake, add icing and give him lots of stuff to decorate with, sprinkles etc. You could even take him to the shop to choose them.
Get paper sweet cases, pour in melted chocolate then put a marshmallow in each. Drizzle melted chocolate over.
Hide and seek but only in the house, we lost ours in the park as they were so good at it!
Finger painting
Sorting out which toys he is too old for - can take ages and requires lots of discussion.
Depending where you live there are lots of museums with things for children or simply going out in the country and looking at all the animals.
Lots and lots of walking, running and observing.
I could go on and on with what 3 yr olds like including all that has been said before. When you are exhausted playing Dead Lions will give you a short respite!
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! I had things which he usually enjoys lined up to do, but as the day went on he became very reluctant to do anything much. He didn't want to go swimming, or make cakes or do anything but play on the iPad, which he knows there are rules about. He had a new Harry Potter book so I suggested, as he hasn't got one, we might make a nice bookmark, which we started and then he drifted away from it. I know he had a severe case of cabin fever as the weather was awful and we couldn't get out to kick a ball about or go for a walk, but by mid afternoon, he actually said "nanny, do you mind if I go home at teatime?" It was like a hammer blow to me, as he has always loved to be here. We even had a few tears! DH managed to talk him round in the end and he was okay. We spent the rest of the afternoon playing games, and after tea and a bit of tele, he went to bed. I think - I hope - he was just tired. He was okay this morning, but he was going to spend the afternoon with a friend, so he was on a bit of a high. I hope it's not the start of "do I have to go to Nanny and Grandad's?" coming on. It has to come sometime I suppose.

