Should I pretend I'm poor in front of my kids?
Why do you want to make your kids think you are poor?
That way I won't have to spend so much money on them.
If money is actually tight and you are struggling, then you should be honest with your children. However, you are responsible for your children and if you have the money, then you need to spend it to properly raise and take care of them. You don't need to spoil them if you don't want to, but lying to them will cause them not to trust you if they find out about it.
I don't really care about that.
Caring for your children is extremely important. Spending money on clothing and food and items for them is something that parents have to do. I know that can be tough at times, but it's something every parent has to go through. Be honest with them and do your best to properly take care of them and they will appreciate you.