Thomas Gerrity (69) of Sandhurst Avenue, Bispham, has been jailed for two decades – and will serve an extra four years on an extended licence, following a trial at Preston Crown Court.
Gerrity was found guilty of three counts of assault by penetration, six counts of indecent assault and one count of sexual assault.
His two victims were both under the age of ten when they were assaulted.
Detective inspector Andrew Crook of Lancashire Constabulary, said: “Firstly, I want to praise his two victims, who have shown such strength and resilience throughout this process. They should be so proud of themselves for their bravery.
“Gerrity’s crimes are nothing short of abhorrent, and I and my team welcome the sentence handed down on him.
“I hope that this shows other victims of sexual offences that we will listen to you, we will investigate, and we will do all that we can to get you justice. If you, or someone you know have been a victim of a sexual offence, please talk to us.”
If you have been a victim of an offence you can contact police on 101 or speak to charity Crimestoppers on 0800 555 111.