Concerned about multiple fathers of your children?

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So a totally non judgemental question.. my fiancé has two boys with two different mothers, and for the longest time he told me that he did not want any more children cause he can't handle the thought of three different children with three different mothers. Can anyone relate to this? Has anyone else had these worries? Like he could have had 12 kids with 12 moms or 12 kids with the same mom and it doesn't bother me any.