<div dir="ltr">In the shiur of R Zilberstein last night he discussed the situation of a parent (usually father) who deserts a child in the hospital or even leaves the family.<div><br></div><div>One case involved a father who showed up before the daughter's marriage and insisted that his name appear on the wedding invitation. R. Zilberstein paskened that the father who abandoned the family has absolutely no rights to anything. If the mother remarried then the adoptive father has the right to all decisions. Kibud Av ve-Em applies to the adoptive father and not the biological father that abandoned the family. Hakarot hatov is for the help of the adoptive family and biology contributes nothing.</div><div><br></div><div>Though not the topic of the shiur if the mother is a shifcha or a nonJew the father (who stays with the family) is entitled to all rights of a father including kibud Av independent of any halachot of yichus. He is not worse than an adoptive parent (my conclusion not discussed in the shiur)</div><div><br></div><div>The only exception to this rule is sitting shiva. One is required to sit shiva for the biological father and may sit shiva for the adoptive father. When questioned he explained that not sitting shiva for a father even if he did nothing for the family might hint of mamzerut<br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font color="#000099" face="'comic sans ms', sans-serif">Eli Turkel</font></div></div>
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