In fact, I have an in-law relative named
Jenny, not
Jennifer.
I suppose it's ok, but I'd use the name
Jennifer.
I like
Jennie best.
By the way, most of my in-laws(the in-laws again!) assume my name is
Jennie and call me that. It's not, it's
Jean, very occasionally
Jeanie.
I don't correct them, though. It's ok, I know when they mean me.