The work also contains the word “equality”, written in English over a rainbow flag.
Regional councillor Matteo Montevecchi, from the right-wing Lega party, used social media to attack the work that appeared on a wall in Via Savonarola.
Montevecchi accused the centre-left Rimini town council of being "complicit" in the street art "crime", and turning a blind eye to it.
"In the same space last year there was another mural with the transgender flag that you see above in the photo, which appeared a few days before Pride,” he said in a press conference.
“I wonder, along with many citizens: was any permission granted to carry out these provocations?
“Or are we facing a complacent municipal administration, since it is turning a deaf ear, without having these defacements, located in front of the garden of the Church of St. Nicholas, cleaned up?
“Are these defacements okay?"
Rimini Mayor Rimini Jamil Sadegholvaad, of the centre-left opposition Democratic Party (PD), which has led events in support of same sex couples' parenting rights, defended the work.
"Art of unconventional visions which have a public profile will always find asylum in Rimini," he said.
Sadegholvaad explained that the piece had been painted by a collective of local writers on a space made available free of charge by the municipal administration.
Lega has backed the ban on registering the children of same sex couples and has used the case to reiterate its opposition to the "odious" practice of surrogacy, which many Italian same sex couples use in other countries to have their children.
Senior government partner Brothers of Italy (FdI) has called surrogacy "worse than paedophilia".
They have filed a bill that would prosecute Italians who resort to surrogate mothers abroad, in countries like Spain and the US where it is legal, making it a "universal crime".
ANSA
