I agree that adults who still stay in contact and are close to relatives deserve what they receive. Example, when my Grandmother died, I received more than my cousins, and my daughters received more than her other great grandchildren. (I'm not talking money, but other stuff, like jewelry, etc.)
That was because I and my children kept in contact, we visited, etc. I traveled and took care of her towards the end because I loved her. She had never even met half her great grandchildren, and they were only 3 hours away! (That I blame on my cousins, who only contacted her with birth announcements, but never made the effort to see here.)
Once a child becomes an adult, it is up to them to remain in contact.