My two and half year old grand son is behaving strangely at times..?

The child weeps unconsolably when some melodious songs /tunes are played in the radio /TV or sung by his mother..
He is afraid to play with some big dolls... to mix with other children...
How to handle him and make him understand... Pl advise
Update: He is otherwise normal and affectionate with his mother and members of the family.. He learns rhymes and words with interest and shows terrible memory... He also likes rhymes but shows some emotion toward some tones appearing to be melancholic.. His father is estranged with his mother and staying with his... show more He is otherwise normal and affectionate with his mother and members of the family.. He learns rhymes and words with interest and shows terrible memory... He also likes rhymes but shows some emotion toward some tones appearing to be melancholic..
His father is estranged with his mother and staying with his parents... And his mother is a working woman who however spends most of her leisure with the child and teaches him words, songs etc...
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