Please correct my mistakes.

I was reading the Dear Abby (Always italicize the titles of books, magazines, newspapers, academic journals, films, tv shows, long poems, plays, operas, musical albums, artwork, websites, etc.) letters . I always read it them (since you used "letters" you are implying that you read more than one. Use "them" instead of "it" in this case). It gives me an insight into the culture ,  (you do not need a comma here. It should read: "It gives me insight into the culture and the problems of other people.")and the problems of other people. I was astonished with the big difference of the culture and custom of the person who wrote the letter.
She was a M mom (while mom is a title, you do not need to capitalize it) who had just become a G grandmother (same goes for grandmother) for the first time ,  (no comma here) and she was asking whether it is okey (was okay) for her to visit her daughter, or should she just wait for the daughter to invites her?
It is just so weird to me because in my culture the mother always have (has) the right to show up in her daughter's house at anytime, (comma here) and it wont (wouldn't) be a P problem (lowercase "p". "Problem" is not a person or a place).
And Also, in my culture, when the mother become a G grandmother for the first time, she will be (is) the second person to see the baby,  even before his (the) father get (has) the chance to see him (because father's are not allowed inside the labour room). Then, the newborn (newborn is one word, not two) baby and his (its, use this, unless you specify the gender. You did not for this article, so use "its".) mother spend two to three weeks in the grandmother's house .