I have lately been wound up by various people who insist on believing the fable that Edward III was fathered by William Wallace.
Let me set it out in plain terms for the hard of thinking. He wasn't! Edward III was not born until several years after Wallace's death. Human biology teaches us that the normal term of pregnancy is nine months, not seven years! Moreover, Queen Isabella was only 9 or 10 years old at the time of Wallace's execution, and she was still in France.
Edward and Isabella had several children and Edward also had at least one outside marriage. Fact - it is possible for a gay man to father children. Many if not all of us descend from such men in our ancestry, given that until very recently it was common for them to marry and give the appearance of being 'normal'.
There really is no reason to believe that Edward III was fathered by anyone other than Edward II - but he certainly wasn't fathered by William Wallace.