Bottom line is- He won.

He "acted" upset, now you give him a "brother-in-law" deal that you shouldn't have to!!
Especially moving his old crap that you know will not last long before "issues" will come up---Have you EVER HEARD THIS? - "It never did that in the OLD house".
We try to NEVER re-use old gear, we explain why it will cost more than using new gear.

Charge your "Normal" rate, or let him use the "cheap" guy.