1. The first blank should be filled with a word that completes the phrase "in our grandad's". Based on the context of holiday plans, "footsteps" is a likely completion.
2. The second blank follows "Grandad travelled". Given the subsequent sentence mentions travelling to Britain, France, etc., a suitable completion would be a place or a general term like "somewhere".
3. Therefore, the completed sentences could be: "going to follow in our grandad's footsteps. Ha! Grandad travelled somewhere."