Inheritence

You're right ut has to be a parent. The only account I could find to open for a grandchild was a Halifax Regular Saver for children so depends how old the grandchild. Junior ISA's, they have to be 16 I believe.

If they have to be 16 will have to investigate,thanks

If your MiL will states her estate is to be shared between her children, then that is what you have to do. Even if you are an executor you are not allowed to hold back the money for grandchildren.

When my Mum died she left estate equally between all 5 daughters. 4 of us agreed to give each of our children £1k each but other sister did not give her children any.I told my children never to tell her children but someone must have told them because my niece came to see me (i was excecutor) and told me how upset she was because she said it felt like her Nan didn't love her as much as other grand kids. I felt awful and had to tell her money was not left directly to any of grand kids but to daughters. I felt mean and was annoyed with sister for not sharing with her children. I think it would have been better if my Mum had left £1k to each granchild as she loved them all deadly and rest shared between daughters equally. None of other sisters would have minded sister had 4 children when rest had 2 or 3.

Moneysavingexpert website explains the isa's. They don't have to be 16.
The parents would have to open the isa and then you could contribute to it.

Just this weekend I was also researching Junior ISA's . My GGD is now 1 year old, and we wanted to put some money into her bank account. Our DGD has yet to open one, so we are atill waiting. I did find out that a child can only have one ISA. But, it appears that if they do not have one already, one could be opened for them, but you have to have the parents permission. Bit of a minefield in fact. £££££.