Do parents get biased when they distribute wealth to their chilldren in old age

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Well, we are 5 siblings, 4 sisters and one brother....undoubtedly brother, being a son, got major portion of the wealth my parents acquired, that is tolerable.My parents are in their 80s now and sold one of their commercial land at a very good price, fine. Though I came to know about the sale of land but did not ask them anything regarding the price or how will they distribute the money thinking they will give equal share to their 4 daughters(which they had mentioned earlier)... after 6 months I came to know that from that money major portion has gone to my youngest sister since she is financially weak.....this is also accepted...now they told other 2 sisters and informed me in the last...actually I've also gone through a major business crisis but she never paid any heed to me because I borrowed some money from her... now still they have quite a good amount with them but when I asked for it the other day for our business my mother gave back to me so badly that it was like a big shock for me saying that I've already borrowed money from her(and that amount is very nominal with regard to the money they have). She also said that she'll not give a single penny, I can take it only after their death and if you need it early, you can get us murdered, saying this she banged the phone.. Now what can I say to such mother.....did she never think that I also have a heart beating inside me and how will I feel(I am a very sensitive person)..what can I say, everynight I wake up at around 2 or 3 and my mother's words get repeated in my mind..Please help!