dystonic cp

[spandanphysio]

hello friends i have 3-1/2 year boy,who's mixed cp with more dystonia.he was premature with her twin sister at the 6 months.his sister is also right sided hemiplegic.right now he can roll and able to sit with sopport.i m attaching some of his photos..what i found that his tightness is dynamic.only comes when he attemps movement.he sits with thorasic lordosis.what can i do to improve his sitting?how can i achieve transitios.as usual therapy not giving satiseactory results..his iq level is normal.