(1), find the least common multiple of 3 and 4. When two numbers are adjacent natural numbers, their greatest common factor is 1 and their least common multiple is their product, so the least common multiple of 3 and 4 is 12, that is, at least 12 minutes later, mom and dad meet again at the starting point.

(2) When we met, Dad walked 12÷3=4 laps, and Mom walked 12÷4=3 laps.

Dad, mom and I set out at the same time and meet at the starting point at least a few minutes later?

Answer: This question is to find the least common multiple of 3, 4 and 6. Their least common multiple is: 3×2×2×3=36 minutes.

I hope I can help you!