I have a family with a lot of kids. Their neighbour was living with his small family somewhere else for a year where their kids had the sibling and grandparents to talk to.

The younger of two had speech problems.

Then they returned home and the neighbour kids made both of them to talk in a matter of weeks and months.

So is this confirming my point? Sorry, I am a bit confused who made who talk etc.

My relatives who had the bunch of kids and their neighbour who had two kids who wouldnt talk.