TL:DR at the bottom.
It is clear that the son requires more attention and help as he has developmental issues and we recently also discovered that he has some problem with his motor skills. (cannot push and pull at the same time, cannot use 2 fingers at once, cannot drink and swallow at the same time). He is unable of writing or reading or performing basic mathematics at the age of 9. His speech is also heavily affected as he pauses often. However, there is currently no plan at all to provide training or some form of therapy to improve his situation for the future.
In his current school they say that he's improving (he's not, he failed a test with basic addition and subtraction that you would do at age 6). I worry that as he grows older, it's going to be impossible for him to make friends or develop meaningful relationship and do activities with people.
The mother (sister-in-law) works as a nurse and has another child that is younger. This child seems 'normal'. At age 5 she can write her own name, play on her own etc. I'm just not sure if there is anything that I can do at all. The father grows less and less involved as he is now married to someone else and already said that he's not interested much in what happens. I don't have the best relationship with the sister-in-law because of language barriers and I work as an educator so seeing something like this and ignore it feels very difficult.
I love the kid and he sometimes sleeps over at our house and we play games together but he struggles a lot as well and I know that this will have a negative impact in the future when he plays with other children. For example, he is unable of using 1 hand to press 2 different keys on the keyboard at the same time. So he would use 1 finger on 1 button and another finger from another hand on a different button. If he needs to switch the key, he has to look at the key. It's hard to explain. It feels like something that should be properly addressed and tackled by some specialists.
How would you proceed? I can provide further information if it's needed.
TL:DR. Child has developmental problems that may or may not be tackled if addressed. Not sure if we should say anything to the mother considering she's not easy to have a conversation with and sometimes acts like a child herself. How would you tackle this situation?
Thank you.