Looking at and talking to a sister-in-law

Q 1: Is it permissible to look at a sister-in-law and talk to her?

(Part No. 17; Page No. 21)  A: It is permissible to talk to one's sister-in-law if it is necessary to do so and she is veiled. Moreover, there should be no seclusion with her and there should be nothing that may cause temptation.