Welcome to the Glen Campbell Forums. Its great to have you on board and we hope you will find the forum topics enjoyable and informative. I have learned a lot from these forums myself because many members have a vast knowledge of Glen's history in regards to his recordings his guitars and of course his music career in general, which as you know spans over 50 years.
In answer to your question Glen does play a variety of instruments 6 and 12 string guitars acoustic and electric. Did you know that Ovation guitars worked closely with Glen to produce several custom models for him and it was his need to be able to play guitar on the Good time hour without the restriction of having to use a microphones to amplify the sound that helped in the development in the pick ups that were introduced into their later models which allowed Glen more freedom to move around on the stage etc. As regards other stringed instruments, Glen also played banjo and mandolin. If you watch the clip of Glen with Seals and Croft singing One people one Planet he plays a mandolin on that song. Glen can also be seen playing banjo on other clips but he tended to let Carl Jackson do that for him in later years.
Your Grandma obviously had a good ear for talent and that seemed to run in the family.
We look forward to hearing from you again Dayli, As a matter of interest when did you see Glen in concert.