Hi,
I'll try to answer both queries.

In 1809 David Fudge was living in Franklin, Warren Co., OH. Source: OH Early Census Index, www.ancestry.com.

In 1810 David Fudge was living in Franklin, Warren Co., OH. Source: OH 1810 Washington Co. Census Index, www.ancestry.com.

In 1850 the Fudge family was living in Monroe, Preble Co., OH.
David Fudge, b. OH, 42 yrs old, farmer.
Catharine, b. OH, 30.
Elizabeth, b. OH, 12.
Mary, b. OH, 10.
Margaret, b. OH, 8.
Ashur, b. OH, 5.

In 1860 David Fudge was living in Washington, Preble Co., OH. Source: OH 1860 Federal Census Index, www.ancestry.com. However, I didn't find the Federal Census.

In 1860 Margaret Fudge was living in Monroe, Preble Co., OH. Source: Federal Population Schedule, OH 1860 Federal Census Index. However, I didn't find this Federal Census, just the index.

In 1850 John, Mary and children Coovert were living in Monroe, Preble Co., OH.
John Coovert, b. NY, 59, farmer.
Mary, wife, b. OH, 45.
Jane, b. OH, 21.
Peter, b. OH, 20, farmer.
John, b. OH, 15 (b. abt. 1835), farmer.
Jacob, b. OH, 13.
Daniel, b. OH, 8.

Also in 1850 a Johnson Coovert was living with the Davisson family in Monroe, Preble Co., OH.
Johnson Coovert, b. OH, 20, farmer.

On the same Census page in 1850 a John Coovert, b. OH, 5 was living with the Shields family.
Elizabeth Coovert, b. OH, 13 was also living with the Shields family.

I looked for the parents of Johnson Coovert, however, I didn't find anything definitive in the Census records. The 1840 Censuses only name the head of household and a tally count of the members of the household.

Probably to find the parents, you'll need to find a book (or books) on Preble Co., OH which list births, marriage and deaths. Google Books is generally a good source or do a web search for Preble County Ohio Births, Marriages and Deaths. You can also contact their local genealogy society.

I did find a family tree on Ancestry for Johnson Ernest Coovert 1830-1878 with father Reuben and mother Besheba. Reuben had a second wife Mary. You can view this family tree by going to www.ancestry.com.

A Johnson Coovert married Elizabeth Fudge 5 Feb 1857 in Preble Co., OH. Source: Ohio Marriage Index 1803-1900, www.ancestry.com.

I didn't find anything else on them.

In 1870 John and Margaret Coovert were living in Dayton, Yamhill Co., OR.
John, b. OH, 25, farmer.
Margaret, b. OH, 26.

There is a family tree on Ancestry which shows John Wesley Coovert b. 1845, Preble Co., OH who died 1920, Yamhill Co., OR. He was first married to Marguerite Fudge b. 1844, d. 1873 and had Alonzo, Letha and Asher.

Then he married Hanna Sargent.

In 1880 John Coovert, wife Hannah and children were living in Dayton, Yamhill Co., OR.
John Coovert, b. OH, 35, farmer.
Hannah, wife, b. VT, 34.
Letha, dau, b. IN, 11.
Alonzo, son, b. OR, 9.
J. M. Botsford, boarder.
Mary Botsford, boarder.

Another family tree shows Margaret Ann Fudge b. 1844, IN who was married to John W. Coovert b. 1845, d. 1920. Margaret d. 1873, Dayton, Yamhill Co., OR. Their children were Alonzo and Letha.

I know I didn't provide the answers, however, hopefully I've given you some new leads. Successful Searching!