Many communities (Turkish, Spanish Portuguese, Yemenite, Iraqi, Lebanese) have a custom to wear the Tallit with all four Tsitsiyot in front.
Some today say this doesn’t fulfill the mitsva of עטיפת ציצית because of the SA’s requirement to have two Tsitsiyot in the front and two in the back.
May one wear his Tallit in the less popular way if it is his family’s custom?