As long as you, individually, have ONLY the family HDHP coverage for the entire year, you would still be considered an eligible individual for that year. So, as an eligible individual with family HDHP coverage, I would say that you can contribute up to the family limit, plus, if 55 or older, you can contribute the additional $1,000 for yourself. Your spouse’s $1,000 allowable contribution for being over 55 would be dependent on when they started being covered by Medicare, and would have to be contributed into their own separate HSA.
Thanks!