My uncle had 12 kids. My grandfather had 10 kids. I only got 2 siblings however though.
For me, having a lot of kids is associated with status and pride. If you actually look at most high status males, they all have loads of kids. Elon Musk has 12 kids for example. You could say pressure. My family all averaged great amount of kids and I have the weight of the surname, to live up to the hope. After all, my family are Evangelical baptists and it's commonly believed that faith encourages procreation as much as possible. In the South of USA, having 6 kids is not uncommon at all. Mormons in the USA tend to have around 8 kids!
Not to mention, the low fertility rate is basically killing the West. If you look at what Elon Musk says, he is predicting an economical/population bust due to how woeful the birth rates have been and the birth rates have been far below the replacement level for a while now. The society is going a very backwards way in my opinion and we and our children will deal with the consequences very soon.