Osteria is street parking only. It is recommend to use the 4 streets surrounding Osteria (Broad St, Mt Vernon St, 15th St & Wallace St). There is a parking garage only a few minutes walk away! It's attached to the Giant grocery store located on the corner of Broad St & Spring Garden St (entrance is on 15th street). Here is the link to the garage. https://www.parkwaycorp.com/parking/locations/510-north-broad-street/philadelphia/pa/19130
Although we love your children, this will be an adult-only affair.