Yes, there is a liquid form of Advil for children. According to the official Advil website [2], there is a product called Children's Advil Suspension that comes in grape flavor and is intended for children aged 2-11 years old. The suspension is a liquid form of ibuprofen, which is the active ingredient in Advil. The website also provides dosing instructions based on the child's weight.

Ibuprofen, the active ingredient in Advil, is a nonsteroidal anti-inflammatory drug (NSAID) that works by reducing inflammation and pain [3]. It is commonly used to treat fever, headache, toothache, menstrual cramps, and other types of pain. According to the Hospital for Special Surgery [3], ibuprofen is generally safe for children when used as directed. However, parents should always consult with their child's healthcare provider before giving any medication to their child.

The Drug Patent Watch website [1] provides information on the patent status of Advil, but does not provide information on the availability of a liquid form for children.

Overall, parents can find a liquid form of Advil for their children in the form of Children's Advil Suspension, which is available in grape flavor and intended for children aged 2-11 years old [2]. However, parents should always consult with their child's healthcare provider before giving any medication to their child [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.advil.com/our-products/childrens-advil/childrens-advil-suspension-grape-flavor/
[3] https://www.hss.edu/pediatrics-difference-between-tylenol-advil-aleve.asp