Hello Kay;
I looked in the NSDAR Patriot Index and found the following information:

William Hoskins/Haskins was not listed.
David D. Rainey/Raney was not listed.

BLAKEMORE Sr, John
Birth: VA Circa 1723
Rank: Capt and PS (Public Service)
Service: VA
Death: TN Before (ante) 6 Dec 1803
Patriot Pensioned: No
Widow Pensioned: No
Children Pensioned: No
Heirs Pensioned: No
Spouse: Ann Tomlin
Spouse: (2) Lucy Morgan Carter

DOUGLAS , Elmore
Birth: VA 16 Jan 1753
Rank: CS
Service: NC
Death: TN 8 Oct 1819
Patriot Pensioned: No
Widow Pensioned: No
Children Pensioned: No
Heirs Pensioned: No
Spouse: (1) Elizabeth Blakemore

For the first two queries doesnt mean they didnt fight, it means that no one has joined the NSDAR Membership using their lineage. You mentioned Hoskins died 1840. Check the 1840 Census and see if he mentions that he fought in the Revolutionary War. It would be on the second half page of the census.

For the last two queries, since someone has established membership in the NSDAR through him, you may obtain a copy of the DAR application by sending a check for $10.00 payable to Treasurer General NSDAR. Provide the patriot information and if you know the child of the Patriot through whom descent is claimed, provide that also. Mail the check along with the information to:

Record Copy Department
Registrar General NSDAR
Administration Building
1776 D Street NW
Washington, DC 20006-5303.

Requests for record copies may take six to eight weeks as they are very busy.

If you are interested in DAR membership, each chapter has members who will assist you in connecting to your Revolutionary Patriot. If you would like more information about joining DAR or finding a chapter in your area, please let me know.

Hope this helps and if we can help you again, please feel free to contact us.

Warmly,
Sara
DAR Volunteer Information Specialist