If Joanne is calling my cell phone it must be serious

Because calling my cell phone is the last resort possible at contacting me. I got a phone call Friday night during my layover at Houston Intercontinental. My brother Don called to tell me that due to Joanne's heart murmur condition, it's causing complications with the pneumonia and she's being admitted to the hospital on Saturday. I explain my travel status and ask for an update Saturday and to expect me in on Sunday, since Saturday is Jimmy's birthday and we have plans. I wait for further information.