..... "looks like her father"
.........
What if... the marriage was faked and the father took the role of fiancee to fool Meguru into thinking big sis is in a relationship when shes actually not...?
.....Nah too far fetched...... or maybe...?
nah, it is too far fetched, meguru knows her father she would have spot it, plus if the father went for a ruse he could easily find a guy to stand in and take that picture. the truth is most likely she does get married with someone and meguru see is that way in order to convince herself that the marriage is wrong
plus it keeps in line with meguru's older sister previous behavior she really wasn't into the whole lesbian incest thing that meguru was pushing her in.