Expect that your mother will be very pleased with your father. Humans are predisposed to see patterns, and psychologically inclined to gather information that supports pre-existing views, a trait known as confirmation bias. they also confuse coincidence with correlation, and correlation with causation.
You may find your prayers answered; that, however, does not mean that it was due to St Therese’ intervention. Or you may find your prayers are not answered; or that they are answered in a manner different from what you desired.
Yesterday was Valentines Day; and it should be no wonder at all that your father brought home roses for your mother. What could be a possible wonder would be that you would receive a rose, unanticipated, on a day other than Valentines Day.