I have applied for a job at Company "A" a few months ago. The recruitment process went smoothly, and at the end I got a job offer. However, I politely declined the offer, since I also got a better offer from another company (doesn't matter which).
Now, I am applying for a job at Company "B", which happens to be a "sister" company of "A" ("B" is a subsidiary of "A"; both are owned by the same parent company).
Should I mention during the recruitment process at Company "B" that I previously got a job offer from Company "A" ? Would it benefit me in any way ? Or is it better not to mention it at all ?