In Chapter 1 the narrator tells us that "Mr. John Dashwood had not the strong feelings of the rest of the family." And yet, Elinor did "consult with her brother," so she must, at least, have respected his knowledge & opinions (on financial matters, most likely).

In Chapter 3 we have the following between Elinor & her mother regarding Fanny's brother Edward:

a reflection which Elinor chanced one day to make on the difference between him and his sister. It was a contrast which recommended him most forcibly to her mother.

"It is enough," said she; "to say that he is unlike Fanny is enough. It implies everything amiable. I love him already."