FIL died same day as anniversary

I need to grieve somewhere, so yall get it. My FIL died extremely unexpectedly (he was 57) on my husband's and my anniversary. I'm devastated at his loss and heartbroken for my 28yo husband and 25yo SIL. 
Even worse, all he ever wanted was a grandkid... And if we gave him his wish this month, it would have to be the day he died thru the day of his funeral... So we're trying but sobbing thru it.... Not the most usual BD lol... 
There are just no words...