One of Sidney Welsh's brothers was Dr. Henry Welsh I, died May 7, 1794. I do not have a birth date. They are the chidren of John Welsh II baptised 1707 St. Catherine Church, Dublin, Ireland adn died 1766 Killyfargy, Co. Monaghan, Ireland and Anne Pilkington b. abt 1703-08 Tore, Westmeath, Ireland. You should be able to find more of each side of their trees on Ancestry. The Pilkington's were prominent in Lancashire, England as well as you will find them in Ireland . (Anne's father ws Abraham Pilkington, Esq. married to Elizabeth West. ) I am descended from Dr. Henry Welsh who's family eventually is in Lancashire, England. I hope this will give you more insight into this family.
Cheryl