How do you approach your friend's cousin?
Make him falll in love with you. Make suer ur friend is ok with it
Should the deceaseds only son introduce his only attending cousin to all his friends attending his mother's funeral or just ignore that cousin while conversing with friends?
My answer would be: The deceased's son should have shown the proper respect to his cousin by introducing him to others in attendance, especially close friends, instead of ignoring the cousin and his wife, making them feel like outsiders. This particular couple kept a close relationship with the deceased aunt over many years and deserved acknowledgment at her funeral.
You inherited a friends estate 3 weeks his cousin died intestate they were first cousins are you entitled to the estate or the cousin once removed?
There is no official relation. Saying "your cousin in law's sister" would be the easiest and most understandable approach. In the English language there is no relationship of "cousin-in-law." That is an erroneous back-construction based on the usage of mother-in-law and the like. Your are either cousins (and related) or not cousins (and not related)