Is there a support groups to help me help my grandpa with the issues of my grandma being placed in a nursing home?

Have you tried to find one where your grandpa lives? You could ask the Social Worker there. Many have them. I attend a support group right in the facility my Dad lives in, and they have been such a blessing. The Social Worker has been available to speak with me whenever I needed to ask questions, or just to talk. I hope that works for you as well. Take care.