It cann't be possible?

Those where the words of Teresa Brisby when she read Jonathan's diary.

There was wrote part of the part of the odyssey suffered by the rats of NIMH

Jonathan described a lady mouse who helped to him for guide the rats for Thorn Valley. He made to her the promise if things are unfavorable then He'll take her kids like his own.

Brisby cried because the lady mouse on the description was her sister Pearl and the little mouse described by Jonathan...

He was talking about Leandro

What did he mean?

That Mrs Brisby nephew would the one for to unite the families of Thorn Valley.