lucius of NY

Lucius is in the 1860 census of Blenheim, Schoharie county, New York under the name of Lucius Plough age 10. He is living with Susanna Plough age 40 and Catymaria age 15.
In 1870 On series M593 Roll 924 page 385 he is living in Roxbury, Delaware county, New York working as a farmer and listed as 19 years. He is living with a family name Dewitt Mongomery as near as I can see. further down the page is Susan Plue working as a domestic servant and listed as age 44. On page 387 there is a Filbert Plue age 13 working as a domestic servant. I can't find Catymaria, bur she would probably be married by this time.
In 1880 Lucius is married and living in Charlestown, Montgomery co., New York Series T9 Roll 865 Page 188 Line 18. He is working as a farm laborer, His wife is Ruth Aage 26, a son John L age 4 and a daughter Nellie age 2. all born NY except Ruth A listed as PA. I would like to find Lucius 's father and any siblings. Any one with information please help. I have also placed this on the Plue mailing list.