Does a father recite Baruch Shepetarani for an adopted son

Question

According to some Poskim, a father should recite a blessing named Baruch Shepetarani when his son turns bar mitzvah age. My question is, should it be recited if a father adopts a son when that son turns bar mitzvah? What about the biological father?

Answer 1

The Rema in OC 225:2 indeed writes a father should say the blessing for his son and such is the Ashkenazi custom. But note this is not a blessing with a source in the Talmud (rather it comes from the midrash), as such the more common custom is to say the blessing without God's name (see there for further details).

A number of poskim allow the father of an adopted child to say the blessing, without God's name, for their adopted son

• R Ari Enkin, see here, the reference to the Pri Megadim is oblique, the PM doesn't write about an adopted son, but about a father's responsibility to educate his son - something the father of an adopted child also has
• R Mordechai HaKohen, (here, using the same Pri Megadim)
• R Shlomo Aviner, quoted here

Other poskim write there is no obligation, see e.g., here.