Based on a true story, how to explain to first grader, what to say when missing a parent?

At the public pool, as i swam laps, i noticed a kid crying. No adult noticed so i swam to see what was happening.

2 brats were taunting a toddler "where is your father. We have a father why don't you". Clearly the kid felt different excluded and probably confused. Same as i felt watching those brats.

So if i were his father, single parent divorced, or widowed, how can i explain why he is missing a mother?

Based on a true story, how to explain to first grader, what to say when missing a parent?
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