Date of birth amongst siblings

[stuckindenmark]

My sister in law (wife’s sister, Canadian) have a date of birth difference that is 3 months old due to an error made by issuing body in country of origin some 20 years ago. Country refuses to correct dob of either sisters. My wife’s sister is now a Canadian citizen. I wish to claim points of adoptability in my express entry profile but this difference means their births on paper are only 3 months apart. They have lived with this wrong information for a long time. I tried to correct this but have not succeeded so far. The legal case has been hanging in courts for more than a year and sees uncertain future. Can I still claim points for my application if I present my sister in law with this incorrect date of birth between two of them.