in the state of ohio, for the hcap program, who are eligible household
members to be considered in the eligibility requirements for income?
In other words, what relations are to be considered as household
members...girlfriend, boy friend, aunt, uncle, parent, cousin, son,
daughter, mother, father etc etc etc???

Here is the definition of "family" given by the Ohio Department of Job
and Family Services Online:

"For purposes of HCAP, 'family' is defined as the patient, the
patient?s spouse, and all of the patient?s children under 18 (natural
or adoptive) who live in the patient?s home...

For HCAP purposes a 'family' shall include the parent(s), their
spouse, and all their children, natural or adoptive, under the age of
eighteen who live in the home. Many errors seem to occur because the
hospitals use tax forms to determine family size or ask patients for
information regarding 'dependents' or 'household size,' which may not
use the same definition of family as used for HCAP.

Note that step-parents and step-children are counted only if the child
has been adopted by the step-parent."

ODJFS Sample Application for HCAP
http://jfs.ohio.gov/ohp/bhpp/HCAP2002.pdf

NOTE: The file linked above is in .pdf format. You need to have Adobe
Acrobat reader software installed on your computer in order to view
.pdf files. If you do not already have this software, a free download
is available here:
 
Download Adobe Reader 
http://www.adobe.com/products/acrobat/readstep2.html 

Google search strategy:

Google Web Search: "ohio" + "hcap" + "family is defined as"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=ohio+hcap+%22family+is+defined+as

Google Web Search: "ohio" + "hcap" + "definition of family"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=ohio+hcap+%22definition+of+family

I hope this information is helpful. If anything is unclear, or if a
link doesn't work for you, please request clarification; I'll be glad
to offer further assistance before you rate my answer.

Best regards,
pinkfreud