My mother's first abdheekam tithi is Purattasi Sukla Panchami, so should be Sep 30, I think. Based on this I plan to come to India for this, and I think sodhakumbham could be done on Sep 29 and gregyam on Oct 1. Question is when to do fourth oona masikam - my elder brother is mukhya karta, but his wife may not be present at that time; his nakshatram is Punarvasu. I am gauna karta, my wife will be there with me, and my nakshatram is Anusham. On checking, I find that homams cannot be done without wife's physical presence - hence the complication as to who is going to be the karta, and based on that, which day will oona masikam be possible. Gopalanji, or other experts, may provide their valued guidance.