Can be a good idea to start with a "fika"!
The level of comfort during the first meeting with the family may vary. If you are new to Sweden or have never worked with a private family before, it is normal to feel a bit uneasy.
The family's and children's feelings can also vary. It is possible that the children have never had a babysitter before or have fond memories of a previous babysitter, and are now skeptical of a new person.
Having a cup of tea together can be a good way to start. When the children see that both you and the parents are comfortable with each other and the atmosphere is friendly, they usually relax and become curious.