Help! We have a 3 year old DS and 1 year old DD. Everything the 1 year old picks up our DS either takes it off her or starts whining and saying he wants it. If she then moves on to another toy or book then the same thing happens. It’s relentless. And it’s not just toys, if she gets a certain plate for her food then he’ll say he wants that one and then sulks. I don’t know what to do to try and change his behaviour but it makes having them both together really hard work and I feel sorry for my DD who constantly just haves things snatched off her. Is this just him being 3 or is this common? Any suggestions very welcome and appreciated. For info I spend good one on one time with each and have tried to talk to him, acknowledge his feelings and ask him to think about what toys his sister might like to play with. But he always just picks some random thing like a single plastic egg and says the rest of the toys are for him 
