Hi Spandanphysio,
Sorry for late reply, as schedule is bit busy and altered in month of fasting. Good to know that some of my advices helped you out.
Activating abductors in side lying would be difficult, if you are trying it as an exercise to pull up leg straight in side lying. I suggested you before to try rolling initiated from legs. This would bring some activity in abductors. Sitting on phsio ball with legs abducted, make child to do arm activity side ways to reach for an object keeping shoulder in abduction and external rotation with elbows in extension would be helpful. Sitting on bench, legs apart, trunk rotations would also activate hip abductors. You can advice parents to use bench for sitting at home with legs apart to inhibit wrong patterns and get more weight bearing on feet.

With small children, we usually try to get interaction first and get to know their interests. Than those activities of their interest could be used to facilitate the right and desired patterns.

I think this child would be able to walk with support, but might need surgical interventions to reduce spasticity. You can check with Orthopedic surgeon for further suggestions.

Childs oro-motor reactions would be due to keeping head and neck in extension to balance himself. Keeping child more in flexion and introducing jaw control within and outside meal time would be helpful.

If child is standing on toes, it doesn’t mean that he has only tight plantarflexors. Plz go through the whole pattern of legs in standing. Activating dorsiflexors is not the solution. Rather try to normalize the tone in legs by keeping them in TIP first. You can progress from sitting on bench with legs apart. after upper limb activities in abduction as suggested earlier, when you feel his abductors are relaxed and feet are well supported on floor in neutral position, you can facilitate pull to stand by making child lean forward on a small table in front, bearing weight on open hands. Let the child to keep standing, keeping the trunk leaned forward (perch st.). keep his legs abducted and ext. rot at hips and knees extended. Once you feel less tone in his legs, ask him to come up extending his trunk. Then again make him to lean forward on table and sit down. This would help to decrease tone in plantarflexors.

There is a book preview "Neurologic intervention for PT", has good pic for manual handling and facilitation. This would be helpful. Scribd.