Is this lathyrism?

Oldest affected boy among 4 similar children in a 6 sibling family. The mother is also affected. The father had smallpox 40 years ago, when he was 2 and a half. The boy in the picture's grandmother lives with them. They do eat khesari dal (lathyrus sativus). This is near Bahutoli in Suti I block (Ahiron BPHC) of Murshidabad. Bahutoli is 5 km from Rajgram station (Birbhum).
There has been a polio case on 28th May in Muraroi 2 (Birbhum district). There is another Polio case recently at Dhuliyan (within 40 km).
In 2007 there was a JE vaccination campaign that covered Birbhum. We met a girl in another home in this village who became disabled after encephalopathy. She was educated up to class 8, but has now discontinued. Her aunt is an ICDS worker.