Do you have older sons? Help please....?

I have five sons. Ages 28,25,22,19,and 14. I also have a daughter who is almost 3. A menopause baby. The father of my five sons just ped away two months ago. I have no man in my life. I work all the time and just have no time. I guess where my ex ped there are things really bothering me. My older sons never invite me to anything. But they don't mind coming here for dinner and ask for me to do there laundry and things like that. My oldest is married. The other three older ones have gf"s. When my 22yr old comes over with his girl he says how they took his girl's lil bro (who is 5) out to eat and how they have her dad and lil bro over to dinner. They have never asked me. I have yet to see there new apartment. I am a good person and would do anything for my son's. But ya know what someday I, like there dad am not gonna be here. Then what. Are they gonna cry at my funeral and say they miss me. When I was right here and they could have spent time with me. The other boy's don't do anything with me either. My oldest and his wife have two girls. I don't see them either. Every Christmas I get a picture of the girls. That's my gift. I send them whatever they want or need. They never ask if I want anything. None of the boy's ever buy me anything. I did always know they were gonna ignore me to some extent when they got gf's. But I did not know it would be this bad. It hurts to not be included in there lives. I don't know what to do to make them realize that if they don't see me now while I am here then I do not want them telling people they miss me when I am gone.