There have been volatile children, they said, a non-verbal child with a difficult background who could become angry, or simply times when children were sad after visiting their birth parents.
"They're really quite down when they come back," said Mrs Bines.
"But McDonald's usually helps, things like that, just to cheer them up."
They described the support from the council as "incredible", saying they never felt like they needed to deal with issues alone.
Mrs Bines said: "I would never look back, it's just worked – it's our perfect life."
All foster parents receive a weekly allowance to cover the cost of caring ranging from about £165 and £289 a week, but can be more depending on the age of the child and level of experience of the foster carer.
Fosterers also qualify for tax relief and are eligible for other allowances including for holidays, birthdays, travel or the costs of buying baby equipment or furniture.
Katy Cole, a councillor and cabinet member for children's services at Peterborough City Council, said: "Fostering is an incredible way to make a lasting difference in a child's life, offering them stability, care, and the chance to experience a loving family home.
"By opening your heart and home, you provide more than just shelter – you provide hope, security, and the chance for a brighter future."