In my opinion The best way to learn vocabulay is to divide words into topics.
EX:
Family
English ---Francais ---spanish ---ِِArabic
Father--- Le pere ---Padre\Papa -----أب
Mother--- La mere ---Madre\Mama ---أم-
Relatives
English --Francais ----Spanish ---Arabic
Uncle ---L`oncle ----Tio ---خال\عم
Aunt ----La tante -----Tia ---خاله\عمه