Hi, Rusty!
Yes, I would say "brother-in- law" .......
The other term was new to me, but I just deduced that was what you meant!
Yes, funnily enough I only found out this morning that "parkrun" is considered to be all one word!
The "marshals" in the park were wearing new hi- viz vests with "parkrun.com" emblazoned on them!
Good for Miss O!
I often fast-walk the route that is run........ and further, too........on a daily basis!
My dog does the "running" part!
Quite a nice puzzle today!
I still have one or two parses to complete......but will look at them again later.
I especially like 4d; 12d; and 23a.