Answer
(Fatwa: 221/165/B=1433)
It is mentioned in hadith:
إن أعظم النكاح بركة أيسره مؤونة .
The blessed marriage is the one which carries less expense.
Hence you should look for any proposal in which you have not to give dowry or have to give to some less extent, but for this you have to come down from your criterion. However, if you do not find any such of proposal and you marry your sister fulfilling their demand, then since in the property of your parents your sister too has her rights after their death; hence if you say to your sister that you would give her these things (dowry etc) but later you shall deduct it from her shares of inheritance and your sister accepts it, then in this case after dividing the Shariah distribution of your ancestral property you can take your expenses. As far as the matter of the two sisters is concerned whom your father married they shall get their complete shares from the property. Whatever the father spent in their marriage it was a kind of gift.
Note: Who was fist to die among your parents? Also, who amongst their heirs were alive at the time of their death? You should learn the detail of Shariah division after writing the details.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband