Not sure where to share, children severely behind.

[Kells296]

Hello! I’m a 29 year old f. My brother that’s 33 years old and his wife that’s 23, have 3 children, the oldest child is unfortunately a product of a sexual assault by the wife’s father. Both my brother and his wife are INCREDIBLY immature and I don’t think they have any idea how to properly parent. other than the children’s basic needs and care not being met in general They’re all so far behind. I noticed today when we took the kids to the zoo that I was pointing at an animal and my nephew couldn’t even comprehend that I was trying to get him to look at the animal. He’s almost 3. He only knows a few words but I don’t think he even understands the meaning and my brother and his wife have NO desire to change it or think that anything is wrong. I want to do something. I’m not sure what. I already have custody of my other brothers children due to him and the mother giving them up willingly. I feel crazy for wanting to take on more but I feel so freaking bad for these kids. I hope this all made sense. I guess I’m just looking for support, advice and thoughts on the situation. Thanks for reading.

Are social services not involved given the circumstances of the eldest’s conception?

Where are based if you've been to the zoo?

Are social services involved? I think that would be a good start. You can let them know you will be prepared to take temporary custody

Could you offer child care for a few hours a day? That might provide the stimulation they need without overwhelming you and your children.

I don’t think OP is UK based so specific advice will be difficult
Do you have any contacts who helped when you took on your other brothers children? Like an equivalent of Social services here?
If so could you contact them?
I have no idea about the system where you are but there’s a very high bar to taking children away from parents here, so as long as basic needs are being met then it’s unlikely there would be intervention.
Do they go to school? If so the school might be able to help

@BunnyRuddington what a tangent! Edinburgh Zoo has been open for a couple of weeks, outdoor areas only, I imagine it's not the only one.