A child's assets - an extra source of income or a heavy burden?

Martin and Kerli are the parents of 3-year-old Anni. Anni's grandmother, Maali, recently died and bequeathed all her assets to Anni. The estate included a valuable property and money in her grandmother's bank account. Anni's parents want to sell the property in order to take the family on an extended trip abroad. They want to invest the money bequeathed to Anni on her behalf. What are Anni's parents' options for using the child's assets?