With a lifetime gift annuity, it is designed as a joint annuity naming yourself and your child or grandchild as joint annuitants. (briansoinsurance.com)
Annuity, Joint & Survivor An annuity that provides income payments for as long as either one of two joint annuitants remains alive. (newyorklife.com)
I recommend setting up the annuity with your spouse (aka joint annuitant) so that the guaranteed income covers both lives. (thebalance.com)