Which of the following statement about the passage is NOT true?
1 Social communication of elderly grandmothers who spend times babysitting their grandchildren increase.
2 In a mutual relationship between grandmothers and grandchildren both sides take advantages.
3 Those grandmothers who have high social interaction may suffer from some mental problems like depression.
4 Grandmothers who spend more than a day weekly for taking care of their grandchildren may get some mental diseases.