Summary: Yes, you would have an actionable claim against him if you were the photographer of all three photos. This is because you would be the copyright owner. Otherwise, it's extremely fact-specific as to whether such actions are unlawful and liable to a claim for damages, etc.
He has no automatic right to use the photographs if he is not the photographer. Copyright rests with the photographer under the Copyright, Designs and Patents Act 1988. If he wished to exploit them commercially, he would have to prove he acquired the photos lawfully and used them in compliance with any conditions set by the copyright owner.
The "self-portrait" implies that you took the latter two photographs in which case you are the author of the copyrighted works and can bar him from using your works for commercial exploitation.
If you took the photograph of your son, then copyright can be used to bar him using that work too.
Furthermore, you and your son have the right to a "private and family life" under Article 8 of the European Convention on Human Rights, implemented through the Human Rights Act 1998. This would extend to the commercial or other exploitation of photographs of your son (a minor). However, there is no automatic "right" to privacy and the UK does not recognise the specific "right of publicity" which would protect the use of your image and/or likeness.
The UK does not have a specific privacy law that would apply to the matter. Most modern privacy claims are built up from a patchwork of other claims.
In the event that you do not hold the copyright to the photograph of your son, you could argue that your father's actions infringe upon you and your son's right to a private and family life under Article 8.
You cannot argue on the basis of "right of publicity" or on any particular ground of "privacy" as the UK does not recognise either particularly strongly at the moment. The best approach at the moment would be Article 8 infringement.
One remedy would be to seek an injunction to prevent publication and exploitation of the photographs. This would be expensive, so I'd recommend engaging a solicitors' firm to write a strongly worded letter before action to your father which should hopefully dissuade him, and then adjusting your privacy settings or blocking him on Facebook to prevent him from doing this in the future.