My mother, who is 93,has just decided she wants to change her will , increasing the gifts to her grandchildren. One grandchild, my son, is a young teen with ADHD and autism, the others who are my sister's,are late 20s/ early 30s neurotypical universiy educated etc. She sees it as having four grandchidren and treating them all the same but I dont think its in my sons interest to potentially inherit a substantial sum as a young adult . I would like the gift put in my trust fo me to invest on my son's behalf - with no age restriction , but the solicitor has told my mother that my son will be entitled to it once he is 18 .
Has anyone had experience of this and what is the best way to go about things ?