Musician usher isn't an attentive father says ex wife after son's accident

Usher's ex-wife is clearly trying to prove a point ... she's a caring mother who deserves custody of their sons -- after the eldest nearly drowned this week -- and this photo tells the story.

Tameka Raymond posted the photo today, the first pic of 5-year-old Usher Raymond V since the horrific accident on Monday ... and it paints a picture of motherly love and protection. Tameka's arms are wrapped around her son, and he's surrounded by get-well-soon balloons.