He can have his FSA and you can have your HSA (and you could get your own FSA, too!). FSA is annual, so use-it-or-lose-it (the laws recently changed to let you roll over $500 annually, but dependent on your company, I think). The HSA money stays around forever, so it's not a bad thing to try to max out all your pre-tax health accounts!
I look at my annual expected health expenses and plan my FSA election from that so that I don't "lose it" if I don't end up using it all. I then reimburse myself from the FSA first, and then when it runs out I do it from my HSA. I keep a spreadsheet and scan all my receipts so that I know which account I reimbursed myself from (cannot double-dip). If I have a big expense that the FSA doesn't completely cover, I just split it between the FSA and HSA and note it accordingly.
It's a bit annoying that my husband and I have so many pre-tax health accounts to manage since spouses cannot merge their accounts, but I hope that we can be healthy and store up our HSA dollars in the long run. Once it gets to be more, we'll look into our options for investing it.