After you file

Hi ghost!  The HSA is in my name.  I'm hoping having my daughter in the HDHP plan all of 2019 (even though the husband is Medicare A on 11.1.19) makes this continuation of family HSA coverage funded in the fourth quarter of 2018 still eligible for our joint tax return pass the test! That would be such a blessing. Figuring out what I need to do for 2018, if anything (don't amend 8889)? Thanks so much in advance.