Cousin-Inlaw Baby Shower

I received an invite to a baby shower to day. I feel like such a grouch because even though I know it's for the baby, it's hard to get over feelings I have for the adults. The shower is for my husband's male cousin and his wife. Now, the husband didn't come to our wedding and I'm pretty sure we were married 1.5 years before I even met him (so I was with my hubs for 3 years before I even knew what he looked like). The wife is really withdrawn and doesn't engage in convo when I've tried (which is weird, since we're both teachers and have common ground). The shower is in their hometown (1.5 hours away) and two weeks after I give birth to my second. I know I shouldn't need a gift to get one, but we didn't received a wedding gift nor baby gift for our first born. I feel bad but I think I'm just going to pretend I never got it.

Not looking for suggestions, but empathizers I guess. I'm really here just to vent because I'm wishing I had someone I actually had a connection with you celebrate in this manner.