Our expert says:
I think you have posted this question before ( unles we heard ealier from your sister !) If not, then look back in the archives of this forum, for the previous discussion of the other very similar case.
Its not necessarily mysterious that this was kept a family secret - in those days such a birth would have been generally seen as a major disgrace and needing to be kept secret, and they could easily have convinced themselves that it would have been unhelpfully upsetting for you and your sister to know.
More curious is why your nasty aunt would have chosen to tell you now. Curioisty on your side is very natural, as is an interest in reaching and meeting this half-brother.
Don't feel pain about possibilities rather than reality - it seems you know nothing about this half-brother except that he was born - he may be miserable or very happy, and may have excellent support and a fine life. Don't assume it must be awful and feel bad about what MIGHT be.
A counsellor could help you to clarify your feelings usefully. The father you loved is indeed still the man you loved - there was, apparently, a complex and difficult episode earlier in his life, which he apparently handled in the way he thought might be best for everyone.
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