Is this normal kid behaviour?

C

So my boyfriend and i have a 16 month old girl together and he has an 8 year old and a 10 year old with his ex. We always had shared custody, pretty much half half, for the four years weve been together and I have a good relationship with them. It isn't perfect, but we do love each other. Well, recently their mother moved back to Haiti and they are living with her full time and we get them for the summers. Huge change in all our lives and we miss them so much when they are gone.

Well they are here now, which is great. The house is full and we are tired and busy but theres a lot of love in the house and the baby is thrilled to have them here.

But I find there are some behaviours that are really irking me, and I know that kids will be kids and they will fight and they need to be reminded of certain expectations, but since they've been back they just do not want to pull their weight. Like this morning, I woke up at 630 like I always do with the baby and the kids got up too. I read to them and we are trying to finish Harry Potter #6 before the end of summer so I read to them this morning before heading to work. I literally have myself 20 Minutes to get ready so I could finish the chapter, which I would never complain about, but I asked if he 8 year old would wash some strawberries for his little

Sister which I took a shower and he flat out refused. Didn't want to. Like, all we do for these kids all the time and they are just so ungrateful. I love to make them healthy and yummy snacks, take them on fun trips, i planned a whole treasure hunt with clues and a water balloon fight for the 8 year old... i mean, i go above and beyond to make them happy and healthy and have fun with us and i get so resentful that he wouldn't even help me with one little thing.

I don't want to hold anything against them- they are kids, but I also want to teach them how to be considerate and responsible people, so my question is, is this normal behaviour for kids? Or should they be more willing to help out around the house?