I am sorry you would be disappointed if one of your grandkids announced they are gay. Believe me, they would already know how you feel. I have a gay nephew who after seeing what his mother put me, her sister, through, will probably never come out, settle for a marriage to a woman he doesn't love, but will to please his mother, and be positively miserable for the rest of his life. I have another friend who is married with 3 boys and at least 2 grandchildren, who confessed to me his attraction to other men, but cannot face this fact, and will not follow through. He lives with enough condemnation from his family.
Point is, if you are inclusive in your own life, it will show. If you say nothing, your silence will say volumes. I have two daughters and if one of them were to tell me they are lesbian, I would be overjoyed! I would be glad that they could come to me and tell me and I would support them unconditionally knowing that they could be who they truly are. I want my kids to be happy, and if that means they are gay, fine by me.
If everyone cared and nobody cried, if everyone loved and nobody lied, if everyone shared and swallowed their pride, we'd see the day when nobody died. IF EVERYONE CARED/Nickelback