I've been able to find the following information on Robert Seal, his mother and grandmother. I'm still working on finding his father.
I haven't been able to solve why Robert ended up in the home in Los Angeles as he wasn't an orphan until then. Many of the kids there were not orphans. One or both of their parents were alive and left them there because they couldn't or didn't want to look after them.
Marie ? (possibly Bouvet) was born in 1867 in Grenoble, France. Marie married Mr. Gorge - so far the date and place are unknown.
The Gorge's had a daughter, Ines, who was born in Buenos Aires, Argentina in 1891. Ines married Mr. Seal - so far the date and place are unknown.
The Seal's had a son, Robert Trevor, who was born 16 April 1917 in Nice. Sometime before 1928 the Seals divorced.
On 27 January 1928, Ines received a visa (in Nice) to emigrate to the US (#2628). On 20 March 1928 she boarded the SS Providence in Marseilles and sailed to New York arriving 9 April 1928. She was listed as 37 years old, a housewife, divorced, 5'7" tall, fair complexion, black hair and brown eyes. She could read and write French and English. She had paid her own fare. She had never been to the US before and intended to stay permanently. She listed her closest relative back in France as her mother who lived at 44 rue Alphonse Karr, Nice. She was going to stay with a friend named Caireus (probably a misspelling) who lived at 308 W 55th in Manhattan, New York City.
In Nice, on 13 October 1928, Marie Gorge and her grandson Robert Seal received visas to emigrate to the US. Her's was #Q2936 and his was #Q2937. On 28 November 1928 they boarded the SS Ile de France in Le Havre and sailed to New York arriving late at night on 4 December 1928. On 5 December they left the ship and went to the immigration hall arriving at 3 pm. Inspector Ryan detained them and entered LPC PH D on their form. That meant Likely Public Charge and Physical Defect. They may have been concerned about Marie's age and health and the fact that they were not being met at the ship. They contacted Ines and at 4.10 pm they were released.
Marie Gorge was listed as 61 years old, a widow, 5'5" tall, with no profession, fair complexion, brown hair and brown eyes. She could read and write French and Spanish. She had paid both her's and Robert's fares.
Robert T Seal was listed as 12 years old, a student, 5'6" tall, fair complexion, brown hair and brown eyes. He could read and write French.
Neither Marie nor Robert had ever been to the US before and they both intended to stay permanently. They listed their closest relative back in France as her cousin, Emilie Bouvet, of 4 Passage Emile Negrin, Nice. They were going to stay with Ines Seal who was now living at 43 Donalson Avenue, Rutherford, New Jersey.
Here I lost track of Ines and Marie. Robert is next seen on the 1930 Census living at the Maude B Booth Home for Boys and Girls in Los Angeles. His details are incorrect as he is listed as being born in Rio de Janiero and that both his parents were born in the US.
On 26 September 1935 Robert made his application for US citizenship. He was listed as 18 years old, an aviation student living at 677 Burlington Avenue, Los Angeles. On 1 November 1938 he is granted US citizenship and is listed as 21 years old, a delivery boy living at 1243 So Westlake Avenue in Los Angeles. There is no mention of his parents on any of his citizenship papers.
At some point later he moves to Illinois.
I'm working on trying to find out what happened to Ines and Marie as well as getting information about Robert's dad.
Hope this helps and isn't information you already have.