Britney Spears is still holding out hope she can rekindle her relationship with her and Kevin Federline's two sons, whose move to Hawaii has left her feeling dejected.A source tells ET that the «Toxic» singer feels «sad and disappointed» about her sons — Jayden, 16, and Sean, 17 — relocating to Hawaii with Federline and their stepmom, Victoria Prince. The source adds Spears hopes they can «rekindle their relationship, get closer, learn from the past, and collectively work towards a brighter and healthier future someday.»It was back in May when Spears signed off on her ex moving to Hawaii.