hello
for SR you have to look at first at the SR AC. In which house this fall. In yours its conjunct your natal AC. This could be a heavy year for you yes. I also had this last year.
Your 10th lord (career and father) is Mercury in 11th house. Mercury gets the next years an opposition from Pluto. But Pluto is the lord of your 3rd house and is transitting your 5th house. So it don´t have to do with your father necessary.
YOur Sister SR (second) had AC in her 5th house and SR SUn in th house. Mars isnt in her 12th house. He is in her 7th house. I dont know if she is already married, but if not it could be possible or she spent most time with going out or she met someone. If yes, this could also indicate children. I know you think because mars is transitting her 12th house. Yes, but a mars transit only lasts two month or so. When you have birthday, the mars may be in her first, second... house.
Your mother Solar return Chart indicate more an change in Partnership. Netpun had transitted her 7th house the last years and leave it now. Also Pluto is transitting her 5th house (ruler of 4th house, familiy, house) and Pluto is conjunct SR Dc. The sun SR from your mother is in house 11, so social life could become more important. And SR Mars is sitting right on her natal ASC, not 12th house.
Last time i had this, i broke up with my boyfriend, but i have other transits.
Sometimes there is for example a pregnancy in this year, but other things are so bad, that the solar return don´t look like it.
You have to look at the outside transits (Jupiter, Neptun, Uranus, Pluto) and which house they rule.