In 1910, Martin P. 21, Luella R. 20 and their daughter, Helen L. an infant (NR), lived in Norwalk, Huron, OH.
In 1920, they were then living with Luella's parents, Wm. and Helen L. WAGNER. William was 71 and Helen 69. The ZINK children were Helen 11, Thelma 8 and Naomi 2.
In 1930, they are still in Norwalk and their three daughters are all single.
I believe Thelma married Fred SELLINGER. The OHDI shows a Thelma SELLINGER, father's surname ZINK and mother's maiden name WAGNER, died 16 Jan 1995 in Norwalk. Fred died 25 Jan 1994 at age 86.
I would suggest you contact the Norwalk Public Library, http://www.norwalk.lib.oh.us/http://www.norwalk.lib.oh.us/ and ask that they mail you Thelma's obit, which should list any survivors.
Fitchville Cemetery is actually 4-5 miles northwest of New London on S.R. 162. That library, http://www.newlondonohio.com/library.htmhttp://www.newlondonohio.com/library.htm, may have some info on Martin and Luella.