The target sample size is 24 parents of 12 children diagnosed with a brain tumor. Our sample size is sufficient to complete descriptive analyses of Aims 2 and 3, and adequate precision for the estimation of effect sizes and preliminary tests of single-arm efficacy in Aim 4.1. This study is powered for adequate estimation of effect sizes, not for efficacy; that is, the study is powered to appropriately detect large effect sizes with lower power for medium effect sizes. If 10% or fewer participants withdraw after COMPLETE Session 1, we will be able to collect data from about 22 parents at least once. Twenty-two parents will provide 61% power for detecting a difference of 0.5 times standard deviation for a two-sided paired t-test with alpha of .05. The same test would have 70% power to detect a difference of .55 standard deviation. This approach is typical and justifiable in pilot feasibility studies to achieve 80% power for detecting only large effect sizes.