Junior Cash ISA (2) – you will need to be someone who has ‘parental responsibility’ of the child to open a Junior Cash ISA on their behalf, so any grandparent(s) would need to be the legal guardian of the child. Grandparents can still pay into their grandchild’s Junior Cash ISA, even if they are not the legal guardian.
Junior Saver (2) – Yes, grandparents are able to open this account as a trustee on behalf of a child of any age. Trustees must be close family members such as parents, adult siblings, parent’s siblings (aunts or uncles) or grandparents.