A deed can never be interpreted as we like and at our options. When the sale deed specifically stated that the purchaser is Radhika W/o Rakesh, no one can interpret legally that Radhika and Rakesh are purchasers. As per sale deed, Radhika is an absolute owner, and her husband Rakesh is not entitled to ever a fraction of share leave alone half share. The name of Rakesh is used for identifying several Radhikas and in this sale deed, the purchaser is that Radhika that is the wife of Raakesh and not any other Radhika. Rakesh just means for identifying the purchaser and nothing else.
When the Registrar expressed a decision on his records, members interpretation may not help.
If you wanted to prevail on your argument, contact local advocate and file a declaration suit and submit your arguments that the deed means that the purchaser Radhika and Rakesh are eligible for equal share because it was stated in sale deed that Radhika was wife of Rakesh and who is Rakesh (son of ..??) not mentioned as he is husband of Raadhika.