No would be the answer club man. The FHPA purpose is to render void any 'conveyance' of any interest by one spouse without the prior consent in writing of the other spouse. Conveyance does not include the devolution of property on death.
Essentially, it boils down to whether there exists a valid will dealing with the deceased parents estate. If there is a will and the testator left nothing to the kids, then the only recourse is a s117 application (i.e that the parent failed in their moral duty to provide for the child), but there is quite strict time limit for bringing an application (6 months- I think). If the parent died intestate than the position, is that 2/3 of the estate goes to other spouse and the other 1/3 is to be divided by the kids. If you are chasing your % of the 1/3 share you will probably need the help of a solicitor.