Especially as the one year old is autistic

That's perfect thank you

For the one year old, you could set up simple sensory play with toys, soft building blocks, or outdoor time in the yard. For the 5 month old, gentle music and looking at picture books can be really engaging. Grandparents can also have fun by doing something simple like singing songs or just spending time talking and playing.

Ill find out as it will be just us going away like it was for valentine's and my 30th he proposed then

Is there maybe a day care center they can go to to help entertain them for part of the day?