Can I demand of my siblings that they take interest in my children (as I take interest in their children) even though they are foster-children? Am I crazy wanting that?

I have a father-son relationship with all 3 kids. (They are in their 20’s and from a middle-eastern country)

My siblings let me down big time in this part. Im sad about that. #FosterFamily #kids #siblings #family #familj #PappasKärlek #LoveFromDad