Yes, grandparents can pay into a Junior SIPP. One option is to pay money to the child’s parent to pay into the account on your behalf. Alternatively, you can usually make a payment directly if you have the account details. Just be aware of the annual Junior SIPP contribution limits. Note that anyone can pay into a Junior SIPP, you don’t have to be family. Friends, godparents, or anyone else who cares to can contribute.