Single parent children

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For those of you who grew up in single parent families:

How do you remember your mother's old husbands and boyfriends?
Have you established parental relationships with any of them and thought of them as your father? Do you remember feeling loved by them? How did you deal when they separated from your mother? Have you ever tried reconnecting with them or keeping your relationships with them? Have they with you? How do you feel about them now as adults?

(Replace genders for the case of a single-father families).