4th baby shower?!

Ok, so my Sister In law is having her 4th baby shower.... she has had 4 boys back to back and has had a baby shower for each..... is that ok? Idk if I'm more frustrated that they are having ANOTHER kid after already telling the family they couldn't afford anymore children but they're going to keep trying til they have a girl, or that they expect everyone to bring gifts for a baby that has more clothes and pampers from the previous children than they know what to do with.... I should be happy for them, but it's just frustrating. Thoughts?