Yes, children were to be seen & not heard!
I grew up in an elderly extended family. The next youngest person to me was my mother. All of the relatives I grew up with (except my mother & father) had been born in the late 19th century. And so I spent a not insignificant amount of time, during my growing up years, going to funerals as each one of them died off. I can still recall standing at the gravesides. There's a song by Judy Collins I'm fond of titled "Secret Gardens" that always takes me back to those times. Here's a link to a YouTube video of it:
YouTube