My husband and I have no children. We are soon to write our wills. We have both worked full time and are now retired with private pensions. I have 2 siblings and so does he. We have 5 nieces and nephews between us. 3 are my biological relations and 2 are his. We want to split the inheritance which will be money and properties so that half go to my family and half to his. We are leaving a token cash gift to our siblings worth 10% total of estate. Is this reasonable ? Do you think there will be any dispute over this ?