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that will do - site a and site b should not request DHPC from one other
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that will do - site a and site b should not request DHPC from one other

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Routers (VPN or native) do not pass DHCP by default, no. It would fundamentally break the broadcast domain model if they did.
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Routers (VPN or native) do not pass DHCP by default, no. It would fundamentally break the broadcast domain model if they did.

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I currently have the following setup:<br />
<br />
Site 1 SBS2011 &nbsp; &nbsp; Domain A - 192.168.0.x - 255.255.255.0<br />
Site 2 Win 2k8 &nbsp; &nbsp; &nbsp;Domain B - 192.168.25.x - 255.255.255.0<br />
<br />
New Server Win 2012 - 198,168.25.x to be installed on Domain A - as secondary DC with DHCP<br />
<br />
Both sites are connected via site to site VPN<br />
<br />
i will be installing a secondary server on Domain A and removing Domain B. <br />
<br />
End goal will be to have both servers hosting there own DHCP servers on one domain, so clients PC's can obtain there own IP's for each site. I'm sure you can have two DHCP servers as they are across different subnets with no relay agent in between. But any confirmation or ideas would be great
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I currently have the following setup:

Site 1 SBS2011     Domain A - 192.168.0.x - 255.255.255.0
Site 2 Win 2k8      Domain B - 192.168.25.x - 255.255.255.0

New Server Win 2012 - 198,168.25.x to be installed on Domain A - as secondary DC with DHCP

Both sites are connected via site to site VPN

i will be installing a secondary server on Domain A and removing Domain B. 

End goal will be to have both servers hosting there own DHCP servers on one domain, so clients PC's can obtain there own IP's for each site. I'm sure you can have two DHCP servers as they are across different subnets with no relay agent in between. But any confirmation or ideas would be great

SBS2011 secondary DC with another DHCP server

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).