I liked much of this episode. Pete and Myka. The sperm offer seemed fine to me. I have known gay men who have donated sperm to their lesbian friends so this doesn't seem like a totally strange notion to me. I am sure that there are straight men who would do the same for their best friend (few and far between perhaps but I am sure they do exist . . . and Pete has always shown a feminine/emotional side). I am agnostic on a Pete/Myka pairing. You know HG has found a partner with whom she seems quite happy so I wouldn't want her to leave that life for Myka.
Since Mrs F, herself, had a child and since she has gone through a highly emotional change (being severed from the warehouse and then being reunited), I suppose it is reasonable for her to be interested in life choices.
My guess is that Claudia's sister was introduced when the show runners thought they would have a whole season to play with it. They couldn't just drop it but I suspect everything will be compressed with only 6 episodes.
I am interested in what's up with Valda - hope to see more soon.