since he apparently has a high deductible health plan coverage there is nothing that prevents him from making personal contributions to his HSA a/c to maximize the contribution for a family HSA. if you have no disqualifying health insurance coverage then you and your spouse can split the maximum base HSA contribution of $7300 for 2023 any way you want but you would need your own HSA a/c for "your" contributions since there is no such thing as a joint HSA. if your spouse is over 55 he can contribute an extra $1000 to his a/c only. if you are over 55 you can contribute $1000 to your a/c only. thus the maximum if both are over 55 is $9300
