I'll echo most of what Alfie said, though I didn't think the first part was THAT boring (I didn't love it, but I was engaged enough). The 2nd part (of 3) was the most boring for me - just lots of reminiscing in great detail about things we don't really care about. Like we GET IT, you're a family and you've had a lot of meaningful memories together. Though I did enjoy the bits where...
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The ghost of the dad was puttering around the house.
I agree that the last of the 3 segments is the most entertaining, and ultimately the most moving. Though of course the 3rd part wouldn't have meant anything to us without the context from the first 2 parts, so in that way it all sort of came together in the end.
Not a brilliant piece of theatre, but worth a visit if you like Ruhl's work. For my part, I think her earlier work was much better than her recent stuff, but I still find her intriguing enough to keep seeing her new plays.