Hey Amber
My FIL had brain surgery almost 16 years ago, to remove a tumour.
He contracted two bouts of chemical meningitis and pneumonia, post-op.
He is alive and well today
What medication is your FIL on, do you know?
FIL was put on hefty amounts of Dexomethazone (an anti-inflammatory) for 4 months afterwards (any longer than a month, we found out a few years back, is not advised) As a result, he's going in to have his second hip replacement surgery on Wednesday (he had the first one replaced 3 years ago) as the drugs eroded his hip joints.
It took a long time for him to recover completely (it knocked him around, emotionally), but he's otherwise fine
Big big big big HUGE hugs to you and your family.
Feel free to PM me with any further questions. I wasn't around at the time of the op, but I've known FIL for 8 years and DH is only happy to relate his experiences
I hope this helps? My thoughts are with you